Oxygen reduction electrocatalysis on transition metal-nitrogen modified tungsten carbide nanomaterials
Carregando...
Data
2018
Data de publicação:
Autores IPEN
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Journal of Electroanalytical Chemistry
Exportar
Resumo
Considering the technological importance of the oxygen reduction reaction (ORR) and the cost constraints of
highly catalytically active precious metals, recent research efforts have been focused on designing and synthesizing
earth abundant non-precious metal catalysts for this reaction. Among recent advances in this area,
transition metal-nitrogen modified tungsten carbides can be pointed as prominent candidates as ORR electrocatalysts.
Nevertheless, mechanistically understandings of which active sites are responsible for the ORR electrocatalysis
on these materials are required for the rational design of suitable materials. In the present work,
various tungsten carbides and iron-nitrogen modified tungsten carbides catalysts are synthesized and in-depth
characterized through various physical and electrochemical techniques towards gaining insights on the ORR
process on these materials in both acidic and alkaline media. High performance materials are developed, with
the most active presenting only a ca. 0.060 V increase in the ORR overpotential, compared to a standard platinum
catalyst in an alkaline medium. The in-depth analyses allowed for suggestions on reaction pathways for
the oxygen reduction on the hybrid Fe/N/WC/C nanomaterials in terms of active sites. These finds might direct
further developments in the research on transition metal-nitrogen modified tungsten carbide materials.
Como referenciar
REGO, ULISSES A. do; LOPES, THIAGO; BOTT-NETO, JOSE L.; TANAKA, AURO A.; TICIANELLI, EDSON A. Oxygen reduction electrocatalysis on transition metal-nitrogen modified tungsten carbide nanomaterials. Journal of Electroanalytical Chemistry, v. 810, p. 222-231, 2018. DOI: 10.1016/j.jelechem.2018.01.013. Disponível em: http://repositorio.ipen.br/handle/123456789/30522. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.